V type bedplate for paper pulp beaters



Oct. 3, 1939. LE R BOLTON 2,174,774

V TYPE BEDPLATE FOR PAPER PULP BEATERS Filed July 8, 1956 2 Sheets-Sheet 1 ATTORNEY.

Oct. 3, 1939. A. LE R. BOLTON I V TYPE BEDPLATE FOR PAPER PULP BEATERS Filed July 8, 1936 2 Sheets-Sheet 2 w E 2 W W) Patented Oct. 3, 1939 UNITED STATES PATENT OFFICE V TYPE. BEDPLATE FOR PAPER PULP BEATERS Application July 8, 1936, Serial No. 89,540

3 Claims.

This invention relates to beater engines used in preparing the stock for paper making and particularly tothe bedplates used in such engines.

The usual beater engine includes an oval tank in which a cylindrical beater roll revolves so as to carry the stock up and over a backfall and against knives in What is known as a bedplate.

The beater roll is provided with radially projecting bars of metal and the bedplate is usually made up of knives made of metal, the faces of the knives and bars coming close together.

The knives and bars, therefore, wear out and should be and generally are replaceable. The bedplate is located in a box usually of metal which is a relatively permanent part of the machine and is located either directly under the axis of the roll, in the backfall, or sometimes in other locations. This invention has to do with the type of bedplates which are made up of a plurality of metal knives bolted or otherwise fastened together as a unit which can be installed in or removed from a holding box. Such assembled bedplates are usually installed in the bedplate box and are held in place by wooden fillers or check pieces and by wedges.

In some cases, all the knives are of the same thickness while in others, the front and back knives, which I will call holding knives, are relatively thick and heavy, while the knives between them are relatively thin and are frequently separated by fillers of Wood or other material. In some cases, the thin intermediate knives are corrugated or curved in S shapes when viewed from the top.

I am aware there are bedplates in which the knives are straight and run parallel with the front and back of the box and with the axis of the beater roll, and I am also aware that there are bedplates known as elbow bedplates in which the knives are bent slightly in the middle, each branch forming an angle of from 2 to 6 degrees with the front or back of the box and with the axis of the roll.

I am also aware that there are bedplates in which the knives form a much greater angle, such as from to 45 degrees, with the back and front of the box and the axis of the roll, all knives sloping in the same direction.

' When the angular or elbow bedplate is put in a box, the single triangular space at the back and the two triangular spaces at the front are filled with cheek pieces generally of wood, which simply fill the spaces and with the Wedges help to hold the bedplate in position,

For convenience, I will call the base, any line parallel with the axis of the beater roll and with the front and back of the holding box.

This invention is the use of knives which diverge from the middle of the back at a high 5 angle, preferably between 35 and 45 degrees in both directions toward the front, meaning by front the place where the stock enters as it is carried along by the beater roll.

In other words, the knives converge from the 10 front towards the middle of the back and make with the base a large instead of a small angle.

One purpose of this device is to correct the tendency of the stock to work out at each side, which tendency necessitates certain precautions in 15 making the roll and other parts, and to direct the heavier, coarser stock toward the middle of the roll and of the bedplate instead of being allowed to escape at the sides.

The part of the stock which is in best condi- 20 tion will, therefore, pass through on the sides and the stock whichneeds more treatment will automatically be directed toward the center where. it comes into the relatively sharp angle between the middle knives from which it is very 25 difiicult to escape the action of the beater roll bars or blades.

'My construction can be used with a bedplate having relatively heavy straight front and back holding knives 'or with the elbow construction 30 having bent front and back holding knives, and with the intermediate knives either of the same thickness as the holding knives or of a different thickness. In any event, the intermediate knives diverge at a fairly large angle, such as from sixty to one hundred and twenty degrees, while the front and back knives may be parallel or may be bent so that their end portions diverge at a much greater angle, such as one hundred and 40 sixty to one hundred and eighty degrees.

In every case, the cutting knives or members converge from the front to the middle of the back, their end portions making an angle of between thirty and sixty degrees with the base while the angles of the ends of the holding knives, if there are any, with the base are much less, as from nothing to perhaps twenty degrees.

In a modification, I can use the angle or elbow type with front and back angular holding knives and also additional straight parallel holding knives between which are still other intermediate knives which may be set at a still different angle.

In the drawings,

Fig. 1 is a diagrammatic plan view of a heater engine.

Fig. 2 is a sectional side elevation showing the beater roll, backfall and bedplate of a typical beater engine.

Fig. 3 is a plan view of a beater engine bedplate receiving box removed from the beater and with a preferred formof bedplate in place.

Fig. 4 is an elevation as from the left of Fig. 3.

Fig. 5 is a plan view similar to Fig. 8 of a modified construction, and

Fig. 6 is an elevation from the left of Fig.- 5.

Fig. 7 is a plan view similar to Figs. 3 and 5 of another modification, and

Fig. 8 is an end View from the left of Fig. 7.

Fig. 9 is a plan view similar to Fig. 3 of another modification, and

Fig. 10 is an elevation as from'the left'of Fig. 9.

Fig. 11 is a plan view similar to Fig. 3 of another modification, and

Fig: 12 is'an'elevation as from the left of Fig; 11.

Fig. 13 is a plan'view similar to Fig. 3 of another modification, and

Fig. 14 is an elevation as from the left of Fig. 13.

Fig. 15 is-a plan view similar toFig. 3 of another modification, and

Fig. 16 is an elevation'as from'the left end of Fig. 15.

Fig. 17 shows another means of holding the cutting members together, and

Fig. 8A is a detail of a preferred form of bolt.

Inthe drawings, Arepresents the oval tub common in beater engines, 90 is the midfeather and 9I' is the backfall. B is the receiving box for the bedplate Pand C is a beater roll of the ordinary type, while W represents the wedge generally used to hold the bedplate in the receiving box.

'In Figs. 3- and 4, P represents a bedplate of what is known as the elbow type-in which I is a relatively thick and strong bent back holding knife and2 is a relatively thick and strong front holding knife. The ends I, I of back knife I are preferably somewhat bent so as'to reduce the number of short intermediate end cutting knives 5," 5' between which are relatively short separating members 8; 6 while 3, 3 represent the longer intermediate cutting knives/which, as shown, are

thinner than-th'e'holding knives land 2 and which radiate in opposite directions from the middle of the back holding knife I, like fishbones. These intermediate knives 3 are separated by separating members 4, 4 which, as shown, are of less height than the knives and which may be of wood or other suitable material.

This assembled bedplate P is held together as a unit by bolts such as 88 which pass through suitable holes in the. front and back holding knives I and 2 and through the intermediate knives3 and 5 and-separators 4 and 6.

Preferably the cutting knives 8 at the middle are bent in the form of a V and these determine the angle of the other cutting knives 5, 5 and 3, 3, and also the angle of the ends I, I although it is 'obvious that these center knives 8, 8 might each be made of two smaller knives brought together at one end.

' BoxB has a back IUI, front I82 and one end I83.

Between the back IOI of the box B and. the back 'of holding'knife I is a cheek piece 93 in the form of a double wedge with the small parts combined, and between the front Wall I02 and the front holding knife 2 is another cheek piece 92 of triangular shape which is, however, separated from the front wall I92 by a wedge W which is driven in from one end so as to hold the entire assembly together and permit the receiving box B, the bedplate proper P, together with the cheek pieces 93 and 92 to be handled as a unit. The intermediate knives 3 and 5 radiate from the middle of the back at angles of approximately 38 in both directions towards the front or converge from the front towards the middle of the back. A

In Figs. 5 and 6, the bodily transportable unitary bedplate M is made up of the front and back relatively thick holding knives I2 and II substantially of the same shape as 2 and I, but in addition, there are the front straight relatively thick holding knife I9 and the back relatively thick holding knife I8 with bent ends I'I, I1, there being a cheek piece 95 similar to 92, between holding-knives I2 and I9, and another cheek piece 96',- similar to 93, between the bent and straight holding knives II and I8, the whole assembly being held together by bolts such as BI and NH. This is installed as a'unit in a box B and is held in placeasa unit by a wedge W.

Asshown in Figs. 7 and 8-, I may use a bodily transportable unitary bedplate N made up of front and back bent holding knives 2I and 22 between which are the intermediate cutting knives 23 and 25 separated by separators 24 and 26, together with a relatively thick strong straight front holding knife 29 and a similar straight back holding knife 28, preferably with bent ends 21, 21.

Between the front bent holding knife 22 and straight front holding knife 29are additional cutting knives I3 between which are separators I2 andbetween the back bent holding knife 2I and the'back straight holding knife 28 are other additional cutting knives II between which are separators ID, the knives II and I3 being substantially parallel with the adjoining arms of the bent separators2l and 22. Bolts 82 and I82 hold the assembly together.

In-'Figs.'9 and 10, the construction is similar to that shown in Figs. 7 and 8. The unitary assembled bedplate O is made up of front and back bent holding knives 3I and 32 between which are'intermediate cutting knives 33 and 35 and separators 34 and 36, while between the front bent holding knife 32 and the front straight holding knife 29 are the converging cutting knives 'I'I between which are separators I8 and between the bent back holding knife 3| and the straight back holding knife 38 with bent ends I8, I8, are other relatively short converging or diverging cutting knives 15 between which are separators I4. This assembled unit is held together by bolts 83, I83 and rivets I'I8.

Where, as in Figs. 7 and 9 at 21 and I8, there are short knives and separators extending out, I prefer to rivet them to one of the holding knives as by a rivet 85.

In Fig. 3, the head and nut of bolts 88 are countersunk in the cheek pieces, but bolts 8|, IBI 82, 83, I82 and I83 are made with the conical heads and nuts shown in Fig. 8A, and are countersunk in the holding knives. The nuts are cut off at the dotted line as shown.

- In Figs. 11 and 12 is shown an assembled bodily transportable unitary bedplate R in which there are no bent holding knives but there are the front straight holding knife 49 and the back straight holding knife 48 with bent ends 41, 41 and between these, converging from the front toward the middle of the back are the relatively long cutting knives 43 between which are separators 44 and relatively short cutting knives 45 between which are the relatively short separators 46. This assembly is held together by rivets 84 and 81.

As shown in Figs. 13 and 14, instead of assembling a plurality of parts as in the bedplates hereinbefore described, I can use a cast metal unit bedplate such as S in which the front is 52 and back 5!, the relatively long cutting knives are represented by 53 and the spaces between by 54, while 55 represents the short cutting knives and 56 the separating spaces between them. In this construction no. holding knives and no bolts are required.

As shown in Figs. 15 and 16, a bedplate T can be assembled with no separating members, each cutting knife 63 or (55 having its cutting edge bevelled off as shown so that the knives 63 and 65 serve as their own separating members, leaving triangular channels 5'! or 66 between them.

These may be assembled as in the elbow bedplate of angular construction, or of the straight construction such as shown in Figs. 11 and 12, the front holding knife 62 and the back holding knife Bl being shown as of less height than the other knives. 6! is bent at each end 6?. This assembly is held together by rivets 36 and 88.

Such knives 63 can be assembled and spot welded together as at 68 instead of being bolted or riveted.

I claim:

1. The combination in a beater engine having a beater roll carrying radially disposed bars and a bedplate box; of a bodily transportable bedplate in the box having at the front and back straight holding knives parallel with the axis of the roll; bent holding knives between the straight knives which are so bent that their ends con- 2. The combination in a beater engine having a beater roll carrying radially disposed bars and a bedplate box; of a bodily transportable bedplate in the box having at the front and back straight holding knives parallel with the axis of the roll; bent holding knives between the straight knives which are so bent that their ends converge from the front towards the center of the back at a relatively small angle with the base; intermediate knives between the front and back bent holding knives which converge from the front toward the center of the back at a relatively great angle with the base; separating members of less height and between the intermediate knives, together with means to hold the bedplate assembly together as a bodily transportable unit.

3. A bodily transportable bedplate made up of angular holding knives which are so bent that their ends converge from the front towards the center of the back at a relatively small angle with the base; intermediate knives between the front and back bent holding knives which converge from the front toward the center of the back at a relatively great angle with the base; together with means to hold the bedplate assembly together as a bodily transportable unit.

ARCHER. LE ROY BOLTQN. 

